CN110847854A - Squeeze cement tubular column and oil well maintenance equipment - Google Patents
Squeeze cement tubular column and oil well maintenance equipment Download PDFInfo
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- CN110847854A CN110847854A CN201810952763.4A CN201810952763A CN110847854A CN 110847854 A CN110847854 A CN 110847854A CN 201810952763 A CN201810952763 A CN 201810952763A CN 110847854 A CN110847854 A CN 110847854A
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- tube
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- 239000004568 cement Substances 0.000 title claims abstract description 58
- 239000003129 oil well Substances 0.000 title claims abstract description 12
- 238000012423 maintenance Methods 0.000 title claims abstract description 10
- 238000002347 injection Methods 0.000 claims abstract description 173
- 239000007924 injection Substances 0.000 claims abstract description 173
- 230000006835 compression Effects 0.000 claims abstract description 34
- 238000007906 compression Methods 0.000 claims abstract description 34
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 238000004891 communication Methods 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims 2
- 238000007789 sealing Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 239000002002 slurry Substances 0.000 description 20
- 239000012530 fluid Substances 0.000 description 13
- 239000007788 liquid Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 239000007769 metal material Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 229910052755 nonmetal Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000011440 grout Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 230000001788 irregular Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001802 infusion Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/14—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides a cement extruding pipe column and oil well maintenance equipment, the cement extruding pipe column includes: a first injection tube, a second injection tube, a compression tube, and an input tube; the top end of the first injection pipe is communicated with the raw material pump through an input pipe; the air pump is communicated with the first injection pipe through a compression pipe, a second control valve is arranged on the compression pipe, and a pressure gauge is arranged on the injection pipe between the second control valve and the first injection pipe; the bottom end of the second injection pipe is provided with a third control valve; the second injection pipe is formed by sequentially connecting a plurality of middle pipes, and adjacent middle pipes are detachably connected; the air tightness of the second injection pipe is guaranteed, so that when air is injected into the second injection pipe to extrude cement paste in the second injection pipe, the air escapes from the adjacent middle pipes, the pressure on the cement paste is sufficient, more cement is extruded through the leakage holes, and the sealing effect of the casing pipe is good.
Description
Technical Field
The invention relates to the technical field of oil well maintenance equipment, in particular to a cement extruding pipe column and oil well maintenance equipment.
Background
As the use time of the oil well increases, the casing in the underground is corroded by rock or crude oil, so that the inner wall of the underground casing forms a leakage hole; the pressure bearing capacity of the sleeve is reduced, and crude oil in the sleeve flows into the rock opposite to the leakage hole to cause crude oil waste; therefore, how to block the leakage hole on the casing and further maintain the oil well becomes a hot point of research.
In the prior art, when the casing leaks, cement slurry is often extruded into the leaking position through a cement extruding pipe column, and then the leaking casing is plugged by the cement slurry. The cement extruding pipe column comprises: when the packer is used, the injection pipe is lowered to the upper part of the leakage hole from the top of the casing pipe, and then the packer is arranged between the casing pipe and the injection pipe so as to seal a gap between the casing pipe and the injection pipe; injecting cement slurry with a preset volume from the top of the injection pipe, wherein the cement slurry flows into the casing pipe from the bottom end of the injection pipe; then introducing gas with certain pressure into the injection pipe, and keeping for a period of time; in the process, the cement slurry flows outwards along the position of the leakage on the casing under the action of gas pressure, and after the cement slurry flowing into the outside of the casing is solidified, the solidified cement slurry can seal and block the leakage hole on the casing; and then the injection pipe is pulled upwards, and the injection pipe is taken out from the sleeve.
However, the injection pipe is formed by connecting a plurality of steel pipes in sequence, the rear end of the former steel pipe is provided with an external thread, the front end of the latter steel pipe is provided with an internal thread, and the internal thread and the external thread are matched to realize the connection of the adjacent steel pipes; among the prior art, the leakproofness between two adjacent steel pipes can't be guaranteed for when the gas of certain pressure is injected into to the injection pipe in, gas escapes between the adjacent steel pipe, and then leads to the pressure that grout received not enough, causes easily that the grout extruded along the small opening is not enough, and the shutoff effect of sheathed tube is poor.
Disclosure of Invention
In view of the above, the present invention provides a cement extruding pipe column and an oil well maintenance device, so as to solve the technical problems in the prior art that the sealing property between two adjacent steel pipes cannot be ensured, so that when gas with a certain pressure is injected into an injection pipe, the gas escapes from the adjacent steel pipes, so that the pressure applied to cement slurry is insufficient, the cement slurry extruded along a leak hole is easily insufficient, and the plugging effect of a casing is poor.
The invention provides a cement extruding pipe column, which comprises: a first injection tube, a second injection tube, a compression tube, and an input tube; the top end of the first injection pipe is communicated with the raw material pump through the input pipe, and a first control valve is arranged on the input pipe; the air pump is communicated with the first injection pipe through the compression pipe, a second control valve is arranged on the compression pipe, and a pressure gauge is arranged on the compression pipe between the second control valve and the first injection pipe; the bottom end of the first injection pipe is detachably connected with the top end of the second injection pipe, the bottom end of the second injection pipe is provided with a third control valve, and the second injection pipe is used for being lowered into the casing; the second injection pipe is formed by sequentially connecting a plurality of middle pipes, and the adjacent middle pipes are detachably connected.
The squeeze column as described above, preferably, the squeeze column further includes a controller, and the third control valve is an electromagnetic valve electrically connected to the controller.
The cement extruding column as described above, preferably, the cement extruding column further comprises an ultrasonic generator and an ultrasonic receiver, wherein the ultrasonic generator is arranged at the bottom end of the second injection pipe, and the ultrasonic receiver is arranged on the ground; the ultrasonic generator and the ultrasonic receiver are both electrically connected with the controller.
The squeeze pipe column as described above, preferably, the squeeze pipe column further includes a display, the display is electrically connected to the controller, and the display is configured to display a time interval between the ultrasonic wave emitted from the ultrasonic transmitter and the ultrasonic wave received by the ultrasonic receiver.
The squeeze cementing pipe column is characterized in that the controller is arranged on the ground, the controller is connected with the electromagnetic valve through a connecting cable, a wire guide groove parallel to the central line is formed in the outer wall of the second injection pipe, and the connecting cable is accommodated in the wire guide groove.
The squeeze string as described above, preferably further comprising a packer disposed between the second injection tube and the casing.
The cement extruding pipe column is preferably provided with a plurality of packers, and the plurality of packers are arranged at intervals along the central line of the second injection pipe.
The cement extruding column as described above, preferably, the pipe diameter of the first injection pipe is larger than the pipe diameter of the second injection pipe.
In the cement extruding tubular column as described above, preferably, an inner thread is provided on an inner wall of the first injection pipe near the bottom end, and an outer thread matched with the inner thread is provided on a side wall of the second injection pipe near the top end.
The present invention also provides an oil well maintenance apparatus comprising: the air pump is communicated with the compression pipe of the cement extruding pipe column, and the raw material pump is communicated with the input pipe of the cement extruding pipe column.
The invention provides a cement extruding tubular column and oil well maintenance equipment, wherein the top end of a first injection pipe is communicated with a raw material pump through an input pipe, and the input pipe is provided with a first control valve; the air pump is communicated with the first injection pipe through a compression pipe, the second control valve is arranged on the compression pipe, a pressure gauge is arranged on the compression pipe between the second control valve and the first injection pipe, and the pressure gauge is used for detecting the air pressure in the first injection pipe and the second injection pipe; the bottom end of the first injection pipe is detachably connected with the top end of the second injection pipe, the second injection pipe extends into the sleeve, and the bottom end of the second injection pipe is provided with a third control valve; the second sleeve is formed by sequentially detachably connecting a plurality of intermediate pipes; when the device is used, every time an intermediate pipe is added on the second injection pipe, gas is injected into the first injection pipe and the second injection pipe through the air pump, the tightness between the intermediate pipe which is just added and the second injection pipe is judged through the change of the indication number of the pressure gauge, and if the tightness is insufficient, a new intermediate pipe is replaced; when the length of the second injection pipe is increased by increasing the number of the middle pipes, the air tightness of the second injection pipe is guaranteed, so that when air is injected into the second injection pipe to extrude cement paste in the second injection pipe, the air escapes from the adjacent middle pipes, the pressure on the cement paste is sufficient, more cement is extruded through the leakage holes, and the sealing effect of the sleeve is good.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a squeeze concrete column according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a squeeze cement string provided in accordance with an embodiment of the present invention in use;
FIG. 3 is a schematic connection diagram of a controller in a squeeze column according to an embodiment of the present invention;
FIG. 4 is a schematic connection diagram of a controller in a squeeze string according to another embodiment of the present invention;
fig. 5 is a schematic connection diagram of a controller in a cementing string according to yet another embodiment of the present invention.
Description of reference numerals:
10. a first injection pipe;
20. a second injection pipe;
30. an input tube;
40. compressing the tube;
50. a sleeve;
60. a controller;
70. an ultrasonic generator;
80. an ultrasonic receiver;
90. a display;
201. an electromagnetic valve;
202. a packer;
301. a first control valve;
302. a feedstock pump;
401. a second control valve;
402. a pressure gauge;
403. an air pump;
501. postliquid;
502. cement slurry;
503. a pad fluid.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
FIG. 1 is a schematic structural diagram of a squeeze concrete column according to an embodiment of the present invention; FIG. 2 is a schematic illustration of a squeeze cement string provided in accordance with an embodiment of the present invention in use; FIG. 3 is a schematic connection diagram of a controller in a squeeze column according to an embodiment of the present invention; FIG. 4 is a schematic connection diagram of a controller in a squeeze string according to another embodiment of the present invention; fig. 5 is a schematic connection diagram of a controller in a cementing string according to yet another embodiment of the present invention.
Please refer to fig. 1-5. The embodiment provides a squeeze cement tubular column, includes: a first infusion tube 10, a second infusion tube 20, a compression tube 40, and an inlet tube 30; the top end of the first injection pipe 10 is communicated with a raw material pump 302 through an input pipe 30, and the input pipe 30 is provided with a first control valve 301; the air pump 403 is communicated with the first injection pipe 10 through a compression pipe 40, a second control valve 401 is arranged on the compression pipe 40, and a pressure gauge 402 is arranged on the compression pipe 40 between the second control valve 401 and the first injection pipe 10; the bottom end of the first injection pipe 10 is detachably connected with the top end of the second injection pipe 20, the bottom end of the second injection pipe 20 is provided with a third control valve, and the second injection pipe 20 is used for being lowered into the casing 50; the second injection pipe 20 is formed by sequentially connecting a plurality of intermediate pipes, and adjacent intermediate pipes are detachably connected.
Specifically, the first injection pipe 10 may be a metal pipe mainly made of metal materials such as copper, iron, and aluminum, or the first injection pipe 10 may be a non-metal pipe mainly made of non-metal materials such as plastic and rubber; the cross-section of the first inlet pipe 10 may be in a regular shape such as a circle, a rectangle, a triangle, or the like, or the cross-section of the first inlet pipe 10 may be in other irregular shapes.
Specifically, the second injection pipe 20 may be a metal pipe mainly made of metal materials such as copper, iron, and aluminum, or the second injection pipe 20 may be a non-metal pipe mainly made of non-metal materials such as plastic and rubber; the cross-section of the second injection pipe 20 may be in a regular shape such as a circle, a rectangle, a triangle, or the like, or the cross-section of the second injection pipe 20 may be in other irregular shapes.
The second injection pipe 20 is formed by sequentially connecting a plurality of intermediate pipes, and the detachable connection between the top end of the previous intermediate pipe and the bottom end of the next intermediate pipe may be various, for example: the two ends of the middle pipe are respectively provided with a first flange, and the first flanges can be connected with the middle pipe in a welding mode or are integrally formed with the middle pipe in a casting mode; in the process of putting the second injection pipe 20 into the sleeve 50, firstly, one middle pipe extends into the sleeve 50 from the top end of the sleeve 50, then the first flange at the bottom end of the next middle pipe is connected with the first flange at the top end of the previous middle pipe through the fastening bolt, the two middle pipes move a certain distance into the sleeve 50, then the flange at the bottom end of the other middle pipe is connected with the flange at the bottom end of the previous middle pipe through the fastening bolt, and so on, the number of the second injection pipes 20 is gradually increased to increase the length of the second injection pipes 20, and further the bottom end of the second injection pipe 20 extends underground. It should be noted that, at this time, a second flange plate needs to be disposed at the bottom end of the first injection pipe 10, and the second flange plate may be connected to the first injection pipe 10 in a welding manner, or the second flange plate is integrally formed with the first injection pipe 10 in a casting manner, and the second flange plate is connected to the first flange plate at the top end of the first injection pipe 10 through a fastening bolt, so as to achieve detachable connection between the second injection pipe 20 and the first injection pipe 10.
Specifically, the input pipe 30 may be a metal pipe mainly made of metal materials such as copper, iron, and aluminum, or the input pipe 30 may be a non-metal pipe mainly made of non-metal materials such as plastic and rubber, one end of the input pipe 30 is communicated with the top end of the first injection pipe 10, the other end of the input pipe 30 is communicated with the raw material pump 302, and the raw material pump 302 may convey liquid such as cement into the first injection pipe 10 through the input pipe 30; the cross-section of the inlet tube 30 may be regular, such as circular or rectangular, or the cross-section of the inlet tube 30 may be irregular. The first control valve 301 may be a valve such as a ball valve or a gate valve that can control the opening and closing of the input pipe 30.
Specifically, the compression pipe 40 may be a metal pipe mainly made of metal materials such as copper, iron, and aluminum, or the compression pipe 40 may be a non-metal pipe mainly made of non-metal materials such as plastic and rubber, one end of the compression pipe 40 is communicated with the first injection pipe 10, the other end of the compression pipe 40 is communicated with the air pump 403, and the air pump 403 may deliver gas with a certain pressure into the first injection pipe 10 through the compression pipe 40; the cross-section of the compression tube 40 may be regular in shape, such as circular, rectangular, or the cross-section of the compression tube 40 may be other irregular shapes. The second control valve 401 may be a valve capable of controlling the opening and closing of the compression pipe 40, such as a ball valve or a gate valve. A pressure gauge 402 is provided on the compression pipe 40 between the second control valve 401 and the first injection pipe 10 for detecting the gas pressure inside the first injection pipe 10 and the second injection pipe 20.
The third control valve is arranged at the lower end of the middle pipe at the lowest end to control the on-off of the middle pipe at the lowest end, and the third control valve can be a ball valve or a gate valve and the like.
The use process of the squeeze cement tubular column that this embodiment provided does: when a leakage hole is found in the side wall of the sleeve 50, firstly detecting the specific position of the leakage hole, then installing a third control valve at the bottom end of the first middle pipe, closing the third control valve, extending the first middle pipe into the sleeve 50, connecting the bottom end of the second middle pipe with the top end of the first middle pipe, connecting the top end of the second middle pipe with the bottom end of the first injection pipe 10, closing the first control valve 301 and opening the second control valve 401, injecting gas into the compression pipe 40 through the air pump 403, allowing the gas to enter the first middle pipe and the second middle pipe through the compression pipe 40 and the first injection pipe 10, and simultaneously increasing the air pressure in the first injection pipe 10 and each middle pipe, and displaying the air pressure in the first injection pipe 10 and each middle pipe as a first pressure value by the pressure gauge 402; then, the second control valve 401 is closed, after the preset time is waited, the indication number of the pressure gauge 402 is observed to be a second pressure value, if the first pressure value is larger than the second pressure value, gas leakage occurs between the first middle pipe and the second middle pipe, at the moment, the second middle pipe is pulled oppositely, the second middle pipe is detached from the first middle pipe and the first injection pipe 10, and the process is repeated after a new second middle pipe is replaced; if the first pressure value is equal to the second pressure value, which indicates that the sealing performance between the first middle pipe and the second middle pipe is good, separating the top end of the second middle pipe from the bottom end of the first injection pipe 10, connecting the bottom end of the third middle pipe with the top end of the second middle pipe, connecting the top end of the third middle pipe with the bottom end of the first injection pipe 10, repeating the above process to gradually increase the number of middle pipes in the sleeve 50, so that the length of the second injection pipe 20 is gradually increased until a preset distance is reserved between the bottom end of the second injection pipe 20 and the leakage hole on the sleeve 50; then the gap between the second injection pipe 20 and the inner wall of the sleeve 50 is sealed, the third control valve is opened, a certain amount of pad fluid 503 is delivered into the first injection pipe 10 through the raw material pump 302, a certain amount of cement slurry 502 is delivered into the first injection pipe 10 through the raw material pump 302, a certain amount of pad fluid 501 is delivered into the first injection pipe 10 through the raw material pump 302, then the first control valve 301 is closed, the second control valve 401 is opened, gas is injected into the first injection pipe 10 through the air pump 403, under the action of gas, the pad fluid 503, the cement slurry 502 and the pad fluid 501 flow towards the underground, the amount of the pad fluid 503 is reasonably set to enable the liquid level of the pad fluid 503 to be positioned at the lower side of the leakage hole, and a fluid column formed by the cement slurry 502 is opposite to the leakage hole, the grout 502 is forced into the leak hole in the casing 50 under the action of gas pressure, and the leak hole is closed after the grout 502 is set. Thereafter, the closure between the second injection pipe 20 and the inner wall of the sleeve 50 is released, and the second injection pipe 20 is pulled upward to take out the second injection pipe 20 from the sleeve 50.
It should be noted that, by controlling the number of the intermediate pipes constituting the second injection pipe 20, the position of the bottom end of the second injection pipe 20 can be controlled, and the preset distance is slightly greater than the sum of the height of the cement column formed by the cement slurry 502 and the height of the post-liquid column formed by the post-liquid 501, so that the bottom end of the second injection pipe 20 is located a short distance above the liquid level of the post-liquid 501; the pad fluid 503 is a liquid having a density higher than that of the cement slurry 502 and not miscible with the cement slurry 502, for example, the pad fluid 503 is liquid asphalt or the like, and fills the casing 50 at the lower part of the leak hole so that the cement column formed by the cement slurry 502 faces the leak hole, the pad fluid 501 is a liquid having a density lower than that of the cement slurry 502 and not miscible with the cement, for example, the pad fluid 501 is diesel oil or the like, and the pressure of gas is applied to the cement slurry 502 through the pad fluid 501 so that the cement slurry 502 is squeezed into the leak hole. The seal between the second injection tube 20 and the inner wall of the sleeve 50 can be of various types, for example: set up the rubber ring on the outer wall that second injection pipe 20 is close to the bottom, the size of reasonable setting rubber ring so that equal interference fit between rubber ring and second injection pipe 20 and the sleeve pipe 50 inner wall to guarantee the leakproofness between second injection pipe 20 and the sleeve pipe 50 inner wall.
In the cement extruding column provided by the embodiment, the top end of the first injection pipe 10 is communicated with the raw material pump 302 through the input pipe 30, and the input pipe 30 is provided with the first control valve 301; the air pump 403 is communicated with the first injection pipe 10 through the compression pipe 40, the second control valve 401 is arranged on the compression pipe 40, a pressure gauge 402 is arranged on the compression pipe 40 between the second control valve 401 and the first injection pipe 10, and the pressure gauge 402 is used for detecting the air pressure in the first injection pipe 10 and the second injection pipe 20; the bottom end of the first injection pipe 10 is detachably connected with the top end of the second injection pipe 20, the second injection pipe 20 extends into the sleeve 50, and the bottom end of the second injection pipe 20 is provided with a third control valve; the second sleeve 50 is formed by connecting a plurality of intermediate pipes in a detachable manner in sequence; when in use, every time an intermediate pipe is added on the second injection pipe 20, gas is injected into the first injection pipe 10 and the second injection pipe 20 through the air pump 403, the sealing performance between the added intermediate pipe and the second injection pipe 20 is judged through the change of the number indicated by the pressure gauge 402, and if the sealing performance is insufficient, a new intermediate pipe is replaced; when the length of the second injection pipe 20 is increased by increasing the number of the intermediate pipes, the air tightness of the second injection pipe 20 is ensured, so that when gas is injected into the second injection pipe 20 to extrude cement paste 502 in the second injection pipe 20, the gas escapes from the adjacent intermediate pipes, the pressure on the cement paste 502 is sufficient, more cement is extruded through the leakage holes, and the sealing effect of the casing 50 is better.
Specifically, the squeeze concrete column further comprises a controller 60, the third control valve is an electromagnetic valve 201, and the electromagnetic valve 201 is electrically connected with the controller 60. The controller 60 controls the electromagnetic valve 201 to be switched on and off, so that the electromagnetic valve 201 is controlled to be switched on and off, and the operation is convenient and labor-saving.
Preferably, the solenoid valve 201 includes a valve body, a valve spool, a valve stem, a spring, and an electromagnet; a valve cavity is arranged in the valve body, the valve cavity extends towards the two ends of the valve body to form an inlet and an outlet, and the inlet is communicated with the bottom end of the second injection pipe 20; the valve body is provided with a telescopic hole penetrating into the valve cavity, the valve core penetrates into the valve cavity through the telescopic hole, one end of the valve rod is connected with the valve core, the other end of the valve rod extends out of the valve body, one end of the spring is connected with the valve body, the other end of the spring is connected with the valve rod, and the spring is used for driving the valve rod to move towards the valve cavity so as to enable the valve core to block the valve cavity and further close the valve; the electromagnet is arranged on the outer side of the other end of the valve rod, the valve rod is a magnetic rod, and when the electromagnet is electrified, the electromagnet attracts the valve rod to drive the valve rod to move towards the outside of the valve cavity, so that the valve core is driven to move towards the outside of the valve cavity, and the electromagnetic valve 201 is opened.
Preferably, the controller 60 may be a single chip or a programmable logic controller. The controller 60 may be disposed at the bottom end of the second injection pipe 20, and a battery electrically connected to the controller 60 is disposed at the bottom end of the injection pipe, and the battery supplies power to the controller 60. The corresponding controller 60 is provided with an antenna, the ground is provided with a transmitting device which can be wirelessly connected with the antenna, when the bottom end of the second injection pipe 20 extends to a position which is a preset distance away from the leakage hole, the transmitting device is controlled to transmit signals to the antenna, the antenna receives the signals and then transmits the signals to the controller 60, and the controller 60 controls the electromagnetic valve 201 to be opened.
Specifically, the squeeze cementing pipe column further comprises an ultrasonic generator 70 and an ultrasonic receiver 80, wherein the ultrasonic generator 70 is arranged at the bottom end of the second injection pipe 20, and the ultrasonic receiver 80 is arranged on the ground; the ultrasonic generator 70 and the ultrasonic receiver 80 are electrically connected to the controller 60. The ultrasonic generator 70 emits ultrasonic waves, the ultrasonic receiver 80 receives the ultrasonic waves emitted by the ultrasonic generator 70, and the controller 60 can calculate the time interval from the ultrasonic generator 70 emitting the ultrasonic waves to the ultrasonic receiver 80 to the ultrasonic waves, so as to accurately calculate the distance between the bottom end of the second injection pipe 20 and the ground according to the propagation speed of the ultrasonic waves; the distance between the bottom end of the second injection pipe 20 and the ground surface can be accurately obtained.
Specifically, when the detected distance between the bottom end of the second injection pipe 20 and the ground is equal to the difference between the distance between the leakage hole and the ground and the preset distance, the controller 60 controls the solenoid valve 201 to be opened to simplify the operation process.
Specifically, the squeeze string further includes a display 90, the display 90 is electrically connected to the controller 60, and the display 90 is used for displaying the time interval between the ultrasonic wave emitted from the ultrasonic generator 70 and the ultrasonic wave received by the ultrasonic receiver 80. The time interval may be visually obtained by the operator to facilitate the operator in calculating the distance from the bottom end of the second injection pipe 20 to the surface.
Specifically, the controller 60 is disposed on the ground, the controller 60 is connected to the solenoid valve 201 through a connection cable, and a wire groove parallel to the center line is disposed on the outer wall of the second injection pipe 20, and the connection cable is accommodated in the wire groove. The cable sets up in the metallic channel, can avoid at the in-process that second injection pipe 20 extended to the underground, the cable damage that the emergence of second injection pipe 20 and sleeve pipe 50 collided with and leads to.
Specifically, the squeeze string further includes a packer 202, the packer 202 being disposed between the second injection tube 20 and the casing 50. The gap between the second injection pipe 20 and the inner wall of the casing 50 is sealed by the packer 202, the sealing performance is good, and after the plugging of the leakage hole on the casing 50 is completed, the packer 202 can be unsealed, so that the outer wall of the packer 202 is separated from the casing 50, and the second injection pipe 20 is prevented from being blocked from moving upwards due to a rubber ring between the second injection pipe 20 and the casing 50 in the process of pulling the second injection pipe 20 upwards.
Preferably, the packer 202 is multiple, with multiple packers 202 being spaced along the centerline of the second injection tube 20. The plurality of packers 202 may further contribute to the seal between the second injection tube 20 and the casing 50.
Specifically, an inner wall of the first injection pipe 10 near the bottom end is provided with an internal thread, and a side wall of the second injection pipe 20 near the top end is provided with an external thread matched with the internal thread. The detachable connection between the first injection pipe 10 and the second injection pipe 20 is realized through the matching of the internal thread and the external thread, and the disassembly and the assembly are convenient and quick.
Continuing with fig. 1-5. There is also provided in other embodiments an oil well maintenance apparatus comprising: an air pump 403, a feedstock pump 302, and a squeeze string as described above, the air pump 403 being in communication with the squeeze tube 40 of the squeeze string, and the feedstock pump 302 being in communication with the input tube 30 of the squeeze string.
In the present invention, unless otherwise specifically stated, the terms "mounted," "connected," "fixed," and the like are to be understood broadly, and for example, may be fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, or communicable with each other; they may be directly connected or indirectly connected through an intermediate medium, or they may be connected internally or in any other manner known to those skilled in the art, unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A squeeze cement pipe string, comprising: a first injection tube, a second injection tube, a compression tube, and an input tube; the top end of the first injection pipe is communicated with the raw material pump through the input pipe, and a first control valve is arranged on the input pipe; the air pump is communicated with the first injection pipe through the compression pipe, a second control valve is arranged on the compression pipe, and a pressure gauge is arranged on the compression pipe between the second control valve and the first injection pipe; the bottom end of the first injection pipe is detachably connected with the top end of the second injection pipe, the bottom end of the second injection pipe is provided with a third control valve, and the second injection pipe is used for being lowered into the casing; the second injection pipe is formed by sequentially connecting a plurality of middle pipes, and the adjacent middle pipes are detachably connected.
2. The squeeze string of claim 1, further comprising a controller, wherein the third control valve is a solenoid valve electrically connected to the controller.
3. The squeeze string of claim 2, further comprising an ultrasonic generator disposed at a bottom end of the second injection tube and an ultrasonic receiver disposed at the surface; the ultrasonic generator and the ultrasonic receiver are both electrically connected with the controller.
4. The squeeze string of claim 3, further comprising a display electrically connected to the controller, the display for displaying a time interval between the ultrasonic transmitter emitting ultrasonic waves and the ultrasonic receiver receiving the ultrasonic waves.
5. The squeeze cementing pipe column according to claim 2, characterized in that the controller is arranged on the ground, the controller is connected with the electromagnetic valve through a connecting cable, a wire guide groove parallel to the central line is arranged on the outer wall of the second injection pipe, and the connecting cable is accommodated in the wire guide groove.
6. The cement extrusion string of any one of claims 1-5, further comprising a packer disposed between the second injection tube and the casing.
7. The cement extrusion string of claim 6, wherein the packer is a plurality of the packer being spaced along a centerline of the second injection tube.
8. The squeeze tube column according to any one of claims 1 to 5, wherein a tube diameter of the first injection tube is larger than a tube diameter of the second injection tube.
9. The squeeze cementing pipe string of claim 8, wherein the first injection pipe is provided with an internal thread on the inner wall near the bottom end, and the second injection pipe is provided with an external thread on the side wall near the top end, which is matched with the internal thread.
10. An oil well maintenance apparatus, comprising: an air pump in communication with the compression tube of the squeeze column, a feedstock pump in communication with the input tube of the squeeze column, and the squeeze column of any of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810952763.4A CN110847854A (en) | 2018-08-21 | 2018-08-21 | Squeeze cement tubular column and oil well maintenance equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810952763.4A CN110847854A (en) | 2018-08-21 | 2018-08-21 | Squeeze cement tubular column and oil well maintenance equipment |
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| CN110847854A true CN110847854A (en) | 2020-02-28 |
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| CN201810952763.4A Pending CN110847854A (en) | 2018-08-21 | 2018-08-21 | Squeeze cement tubular column and oil well maintenance equipment |
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